Some help ladies...

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Okay ladies I'm just lost. So I have a history of preterm labor with my last pregnancy (this is my third). I'm currently 32 weeks and was checked last week and was 1cm and 20% effaced, they checked because I had lost some of my mucus plug a few weeks ago. I never felt contractions with my last pregnancies until after my water broke and I was hooked up to pitocin... so my question what do they feel like? Is it possible to not feel them?